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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            background:-webkit-radial-gradient(#434c57 0%,#000 70%);
            background:-moz-radial-gradient(#434c57 0%,#000 70%);
            background:-o-radial-gradient(#434c57 0%,#000 70%);
            background:-ms-radial-gradient(#434c57 0%,#000 70%);
            background:radial-gradient(#434c57 0%,#000 70%);
        }
        div{
            width:500px;
            height:300px;
            position:absolute;
            top:50%;
            left:50%;
            margin:-150px 0 0 -250px;
            text-align:center;
        }
        header{
            font-size:100px;
            color:#f6f8f8;
            line-height:100px;
        }
        p{
            color:#a9a9a9;
            line-height:30px;
        }
        strong{
            font-weight:normal;
            color:#fff;
        }
    </style>
</head>
<body>
<div>
    <header>404</header>
    <p>
        <strong>concise</strong> . theme  version  1 . 0 . 0<br>
        Simple  and  practical  hexo  personal  blog  theme.<br>
        The  freedom  to  choose
    </p>
</div>
</body>
</html>